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FAIR VALUE MEASUREMENTS - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Financial assets: |  |  |
Securities held to maturity | $ 74,888 | $ 43,770 |
Securities available for sale | 179,046 | 304,637 |
Mortgage servicing rights | 13,733 | 9,582 | $ 5,016
Carrying Amount |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 75,776 | 119,351 |
Securities held to maturity | 77,154 | 45,097 |
Securities available for sale | 179,046 | 304,637 |
Loans held for sale | 1,155 | 648 |
Loans, net | 3,312,145 | 2,871,298 |
Other investments, at cost | 21,542 | 16,495 |
Mortgage servicing rights | 13,733 | 9,582 |
Financial liabilities: |  |  |
Deposits | 3,398,293 | 3,060,229 |
Securities sold under repurchase agreements | 17,191 | 97,196 |
Notes payable | 35,847 | 1,929 |
Subordinated notes | 23,500 | 23,500 |
Junior subordinated debentures | 10,972 |  |
Carrying Amount | Level 1 |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 75,776 | 119,351 |
Carrying Amount | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 74,888 | 43,770 |
Securities available for sale | 179,046 | 304,637 |
Mortgage servicing rights | 13,733 | 9,582 |
Financial liabilities: |  |  |
Securities sold under repurchase agreements | 17,191 | 97,196 |
Notes payable | 35,847 | 1,929 |
Subordinated notes | 23,500 | 23,500 |
Junior subordinated debentures | 10,972 |  |
Carrying Amount | Level 3 |  |  |
Financial assets: |  |  |
Loans held for sale | 1,155 | 648 |
Loans, net | 3,184,002 | 2,832,454 |
Other investments, at cost | 21,542 | 16,495 |
Financial liabilities: |  |  |
Deposits | 3,072,252 | 2,732,007 |
Estimated Fair Value |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 75,776 | 119,351 |
Securities held to maturity | 74,888 | 43,770 |
Securities available for sale | 179,046 | 304,637 |
Loans held for sale | 1,155 | 648 |
Loans, net | 3,184,002 | 2,832,454 |
Other investments, at cost | 21,542 | 16,495 |
Mortgage servicing rights | 13,733 | 9,582 |
Financial liabilities: |  |  |
Deposits | 3,072,252 | 2,732,007 |
Securities sold under repurchase agreements | 17,191 | 97,196 |
Notes payable | 35,847 | 1,929 |
Subordinated notes | 23,500 | $ 23,500 |
Junior subordinated debentures | $ 10,972 |  |

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